Science
In a genetic experiment, plants with pure round green seeds (RRyy) were crossed with plants with wrinkled yellow seeds (rrYY).
(a) Show the gametes formed when F1 was self-pollinated.
(b) A total of 144 seeds were produced which developed into saplings.
Show the ratio in which these traits are independently inherited in these 144 sapling.
Genetics
9 Likes
Answer
Given : Round (R) dominant over wrinkled (r); Yellow (Y) dominant over green (y).
RRyy (round, green) × rrYY (wrinkled, yellow) → F1 : RrYy (round, yellow).
(a) Gametes formed when F1 (RrYy) is self-pollinated
By independent assortment, each F1 produces four types of gametes in equal proportion i.e.,
RrYy x RrYy → RY, Ry, rY, ry
So the self cross is RrYy × RrYy, with both parents making RY, Ry, rY, ry.
(b) Phenotypic ratio among 144 F2 saplings
The dihybrid self gives the classic 9 : 3 : 3 : 1 phenotypic ratio
Round Yellow (RY) =
Round Green (R_yy) =
Wrinkled Yellow (rrY_) =
Wrinkled Green (rryy) =
So, the F2 saplings are in the ratio 9 : 3 : 3 : 1 (Round Yellow : Round Green : Wrinkled Yellow : Wrinkled Green).
Answered By
6 Likes
Related Questions
About 100 acres of forest land was declared as Natural reserve park. The following organisms were predominant in the Natural reserve park :
rabbit, frog, grass, fish, fox, water insects, zebra, peacock, snake, trees, bird, owl, insects, tiger, vulture, duck.
Create a food web comprising two separate food chains with different producers by using the above data.
Draw and explain how the nerve cells help in transmission of impulses?
Neha consumed boiled sweet potatoes and boiled eggs for breakfast. Help her to understand some steps in the process of digestion of the food taken by her by answering the questions given below.
Attempt either subpart A or B.
(a) Which of these food items is rich in proteins? In which part of the alimentary canal is the digestion of this component initiated? Name the enzymes, conditions required and the glands associated with the digestion here.
OR
(b) Which of these food items contains fats? How is it digested?
(c) Which of these food items is rich in starch? How is its digestion initiated?
(d) The figure given below represents parts of the human alimentary canal. Which of these parts will have the maximum amount of digested food as soon as the process of digestion is completed?
Neha consumed boiled sweet potatoes and boiled eggs for breakfast. Help her to understand some steps in the process of digestion of the food taken by her by answering the questions given below.
Attempt either subpart A or B.
(a) Which of these food items is rich in proteins? In which part of the alimentary canal is the digestion of this component initiated? Name the enzymes, conditions required and the glands associated with the digestion here.
OR
(b) Which of these food items contains fats? How is it digested?
(c) Which of these food items is rich in starch? How is its digestion initiated?
(d) How will the digested food be taken up by the alimentary canal?